Thermal Metal Oxide Varistor Circuit Protection Device
AssigneeDongguan Littelfuse Electronics Company Limited
InventorsWen Yang, Hailang Tang, Dong Yu
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Abstract
A circuit protection device includes: a housing (102) defining a cavity (130); a metal oxide varistor (110) disposed within the cavity; a movable electrode (122) attached to a first side of the metal oxide varistor by a solder connection (140); an arc shield (114) disposed within the housing on the first side of the metal oxide varistor and adjacent to the movable electrode; and a spring (120) attached to the arc shield, wherein the arc shield is mechanically biased against the movable electrode along a surface direction parallel to the first side when the spring is in a compressed state. The device is easy to assemble in lower cost and provides fast response to overheating caused by a fault condition.
Claims16
A circuit protection device comprising:
- a housing defining a cavity;
- a metal oxide varistor disposed within said cavity;
- a movable electrode attached to a first side of the metal oxide varistor by a solder connection;
- an arc shield disposed within the housing on the first side of the metal oxide varistor and adjacent the movable electrode;
- and
- a spring attached to the arc shield, wherein the arc shield is mechanically biased against the movable electrode along a surface direction parallel to the first side when the spring is in a compressed state.
A circuit protection device comprising:
- a housing defining a cavity;
- a metal oxide varistor disposed within said cavity;
- an insulator pad disposed on a first side of the metal oxide varistor;
- a movable electrode disposed on the insulator pad and electrically connected to the metal oxide varistor;
- an arc shield comprising an electrical insulator and being disposed within the housing on the insulator pad and adjacent the movable electrode;
- and
- a spring attached to the arc shield, wherein the arc shield is mechanically biased against the movable electrode along a surface direction parallel to the first side when the spring is in a compressed state.
Dependencies are inferred from the claim text.